Hempstead Lake Dam

High HazardSatisfactory ConditionEmergency Action Plan: Yes

Location

CountyNassau
Nearest CityRockville Centre
River/StreamMILL RIVER
Coordinates40.67306, -73.64778

Physical Characteristics

Dam TypeEarth
NID Height24 ft
Dam Height24 ft
Dam Length1,200 ft
Year Completed1873 (153 years old)

Storage & Hydraulics

NID Storage1,220 acre-ft
Max Storage1,220 acre-ft
Normal Storage470 acre-ft
Surface Area149 acres
Drainage Area14 sq mi
Max Discharge323 cfs
Spillway TypeUncontrolled

Ownership & Safety

PurposeRecreation
OwnerNYS OFFICE OF PARKS, RECREATION & HISTORIC PRESERVATION- LONG ISLAND REGION
Owner TypeState
Hazard ClassificationHigh
Condition AssessmentSatisfactory
Last Inspection11/22/2024
Emergency Action PlanYes

Identifiers

NID IDNY00108
Federal IDNY00108
More InfoState Dam Safety Program

Nearby Dams

South Pond Dam 0.4 mi Low Massapequa Lake Dam 9.4 mi Low Upper Massapequa Lake Dam 9.7 mi High Leeds Pond Dam 11.3 mi Low Ridgewood Reservoir Dam 12.5 mi Low